In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

"We believe that Crown Sydney will help attract Asian high net worth travellers to Sydney, in particular from China, creating economic growth, extra taxes and over 1200 jobs for the people of New South Wales."

A independent assessment committee assessed earlier this year Crown's bid as well as plans Echo Entertainment, owner of Sydney's existing casino The Star, put forward.

The committee - chaired by former banking chief David Murray - found Crown's contribution to gross state product and tax was 26 per cent and 31 per cent larger than Echo's respectively.

Mr O'Farrell said on Monday minimum bet standards would apply to Crown's casino.

For baccarat, the minimum bet would be $30 but that equated to an hourly betting minimum of more than $2000, Mr O'Farrell said.

"This is as we said when approving stage two about the Asian-based high-range gaming market," he said.

"It's about high worth individuals. It's about that tourism which Australia catches a very small part of and NSW is determined to be a bigger part."

The government says at least $1 billion will be gained in the first 15 years from licence fees and gaming taxes.

Mr O'Farrell said statutory approvals were still needed from liquor and gaming authority and planning consent for construction, which would include public consultation.

But NSW Greens MP John Kaye said the approval process to date had been anything but independent and accountable.

"It is not surprising NSW is a step closer to another casino with all of the corruption risks, all of the gaming risks and all of the economic risks it brings with it," he told AAP.